Optical communication device and transmission module

Abstract

An optical communication device is configured to include: a laser diode that outputs light; an EA modulator including a cathode and an anode, to modulate the light output from the laser diode on the basis of a high-frequency signal applied between the cathode and the anode; a resistor connected between the cathode and the anode; and a pattern line connected in series with the resistor and having an inductance component, in which each of the laser diode and the EA modulator is formed on a front surface of the high-frequency line substrate or a back surface of the high-frequency line substrate, and the pattern line is formed on a side face of the high-frequency line substrate.

The invention claimed is: 
     
       1. An optical communication device, comprising:
 a laser diode to output light; 
 an electroabsorption modulator including a cathode and an anode, to modulate the light output from the laser diode on a basis of a high-frequency signal applied between the cathode and the anode, the anode being connected to a ground in a same plane; 
 a resistor connected between the cathode and the anode; and 
 a pattern line connected in series with the resistor and having an inductance component, wherein 
 each of the laser diode and the electroabsorption modulator is formed on a front surface of a high-frequency line substrate or a back surface of the high-frequency line substrate, 
 the pattern line is formed on a side face of the high-frequency line substrate so as to be perpendicular to the ground, 
 the pattern line includes a first pattern line formed on a first side face of the high-frequency line substrate and a second pattern line formed on a second side face of the high-frequency line substrate, 
 the first pattern line has a first end connected to a first end of the resistor and a second end connected to the cathode, and 
 the second pattern line has a first end connected to the anode and a second end connected to a second end of the resistor. 
 
     
     
       2. The optical communication device according to  claim 1 , wherein the high-frequency signal is a single-ended signal. 
     
     
       3. The optical communication device according to  claim 1 , wherein
 the high-frequency signal is a differential signal. 
 
     
     
       4. The optical communication device according to  claim 1 , further comprising a capacitor connected in series with the resistor. 
     
     
       5. The optical communication device according to  claim 1 , wherein the resistor has an impedance different from an impedance seen from the cathode to the outside of the optical communication device. 
     
     
       6. A transmission module comprising the optical communication device according to  claim 1 , to transmit the light modulated by the electroabsorption modulator included in the optical communication device.